/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/Widgets/SItemSelector.h
typedef TBaseDelegate_TwoParams< [FReply](API\Runtime\SlateCore\Input\FReply), const [TArray](API\Runtime\Core\Containers\TArray)< ItemType > &, const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & > FOnItemsDragged